Root Cause:
* The Primary Quote field must be included in the Calculating Fields field set to trigger synchronization between the Quote and Opportunity.
Steps to Resolve:
* Navigate to Setup > Object Manager > Quote.
* Locate the Calculating Fields field set.
* Add the Primary field to the field set.
Testing:
* Change the Primary Quote for an Opportunity and verify that the Quote Lines and Opportunity values sync properly.
Salesforce CPQ Reference:
* The Calculating Fields field set ensures proper updates between related objects during key actions like recalculations.